18 ETON NATURE-STUDY 



THE NESTING OF THE STICKLEBACK 



It is by no means difficult to prevail upon sticklebacks to build 

 their nests and lay their eggs in captivity. An aquarium should be 



FIGURE 154. The nest of the seven-spined Stickleback. 



prepared for the purpose as already directed (on page 15) some little 

 time beforehand, and should be well supplied with weed. Into this, 

 at the approach of the breeding season (about the middle of April), 



